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Apple has signed a deal with Dialog Semiconductor to licence the UK chip designer’s power management technology and acquire certain assets, including more than 300 staff.

Apple will pay Dialog an initial $300m plus an additional $300m for product delivery over the next few years. The British firm also won a number of new contracts from the iPhone maker, including the supply of power management, audio subsystem, charging and mixed-signal integrated circuits, according to a statement on Thursday.

Dialog’s shares rose as much as 33.6% in trading in Frankfurt Thursday, the most since October 2002.

The deal comes almost a year after Dialog warned investors that Apple - its biggest customer - could design its own power-management chips in coming years. Dialog relies on Apple for about three-quarters of its revenue, predominantly through the supply of chips that handle charging and manage power in smartphones.

While Apple has developed its own processors for years, the company only recently stepped up the in-house design of components, including graphics, Bluetooth and other phone-related chips. That’s expensive and creates new risks, but helps maintain leverage over suppliers after a wave of acquisitions cut the number of chipmakers it works with.

Apple began using its own graphics chips, or GPUs, in the iPhone 8 and iPhone X. That continued with the recently released iPhone XS and Apple Watch Series 4. Apple uses technology from another UK chip designer - Imagination Technologies - in products like the iPad and Apple TV, but is expected to eventually transition all of its iOS-based products to its own graphics processors.

Following the deal with Apple, Dialog will concentrate on businesses including the Internet of Things, mobile, automotive and computing.

Apple’s new hires consist of around 16% of Dialog’s total workforce, and the US company will also acquire Dialog facilities in Italy, UK and Germany.

Dialog’s 2018 revenue will not be affected by this agreement and the company will continue shipments of current products in production to Apple, the company said in the statement. Dialog will also launch a share buyback program of up to 10% of its outstanding shares following its third-quarter trading update.